Update on the Tapco conversion. Went together easily with no problems. One thing they dont tell you is that you need to buy the piston tube part of the hand rail seperatelt, which adds a good bit more to the expence. It does come with a piece that has a rail on it but you have to do some gun smithing to put it on and from what I read is a huge pain and can easily destroy the furniture so if you plan on ever having the option of going back to original you would be screwed.
I got the 20 rd magazine which doesnt work very well and jams up every now and then. Also you will not have a bolt catch with this magazine and it wont stay open. I am going back to the ten round mag it came with. It does look pretty cool and fits snug though. I left the original wooden piston part of the hand rail on.
All in all I probably wouldnt bother unless you are just bored.